Prove the following identity
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tan^3theta-1^3/tan theta-1
(tan theta-1)(tan^2theta+1^2+tan theta×1)/tan theta-1
;(tan^2+1)+tan theta
:sec^2theta+tan theta
proved
(tan theta-1)(tan^2theta+1^2+tan theta×1)/tan theta-1
;(tan^2+1)+tan theta
:sec^2theta+tan theta
proved
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